Framah, this was about 30 minutes to lay-out and cut with a utility knife, all four layers.
Top mat down: 8-ply, 1/4" Gator, 3/16 gator, 8-ply
There was a framer I ran into in Northern California who had a "Solar Powered" frame shop. The only thing electric was his phone and vacuum press.
He had a 78" mat cutter..... The "bar" was 1/2" thick 4" wide stainless. It was hinged at one end and a eye bolt for the lift on the other end which slightly over-hung the table with a strap going down to a peddle.
He would slid the mat under the bar and line it up on the right side. Then step on the peddle clamping the mat. Then with his DEXTER, would cut the mat.
For ovals he had a "Johnny zip-Zap" which is basically a toy that when you rotate the armature the two plates that the armiture is attatched to slide back and forth or up and down. He had figured out how to turn that into a oval marker.
Once he marked his oval, out came the utility knife; which was also solar powered. Sun out, light enough, cut mat.
Framah, as Patrick points out, there is a time and place for everything. Personally I never want to go back to drilling and nailing frames...
Sliding blind keys and oval pegs are much more Gothic.